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Harriet S. Meyer

The normal adult human body contains on the or- der of a trillion (1012) lymphocytes.… Together, the thymus and marrow produce approximately 109 mature lymphocytes each day, which are then released ...
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The normal adult human body contains on the or- der of a trillion (1012) lymphocytes.… Together, the thymus and marrow produce approximately 109 mature lymphocytes each day, which are then released into the circulation. Tristram G. Parslow(pp40-41) Lymphocytes are the cells that carry out antigen-specific immune responses. The 2 main types are the T lymphocyte and the B lymphocyte, also called the T cell and the B cell. A hyphen does not appear in these terms, unless they are used adjectivally. Historically, the letters T and B reflected the anatomic sites of maturation of the 2 groups of cells, the thymus Less